1 /*
2 * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #ifndef DRM_SCDC_HELPER_H
25 #define DRM_SCDC_HELPER_H
26
27 #include <linux/types.h>
28
29 #include <drm/display/drm_scdc.h>
30
31 struct i2c_adapter;
32
33 ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
34 size_t size);
35 ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
36 const void *buffer, size_t size);
37
38 /**
39 * drm_scdc_readb - read a single byte from SCDC
40 * @adapter: I2C adapter
41 * @offset: offset of register to read
42 * @value: return location for the register value
43 *
44 * Reads a single byte from SCDC. This is a convenience wrapper around the
45 * drm_scdc_read() function.
46 *
47 * Returns:
48 * 0 on success or a negative error code on failure.
49 */
drm_scdc_readb(struct i2c_adapter * adapter,u8 offset,u8 * value)50 static inline int drm_scdc_readb(struct i2c_adapter *adapter, u8 offset,
51 u8 *value)
52 {
53 return drm_scdc_read(adapter, offset, value, sizeof(*value));
54 }
55
56 /**
57 * drm_scdc_writeb - write a single byte to SCDC
58 * @adapter: I2C adapter
59 * @offset: offset of register to read
60 * @value: return location for the register value
61 *
62 * Writes a single byte to SCDC. This is a convenience wrapper around the
63 * drm_scdc_write() function.
64 *
65 * Returns:
66 * 0 on success or a negative error code on failure.
67 */
drm_scdc_writeb(struct i2c_adapter * adapter,u8 offset,u8 value)68 static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
69 u8 value)
70 {
71 return drm_scdc_write(adapter, offset, &value, sizeof(value));
72 }
73
74 bool drm_scdc_get_scrambling_status(struct i2c_adapter *adapter);
75
76 bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable);
77 bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set);
78
79 #endif
80